I noticed you don't do these things here so I thought I should give it a try...
My Fav parts are
The ending of Womanizer:
"Boy Dont Try To Front A-ay Know What just Whatchua-a-are, Womanizer Woman Womanizer ur A Womanizer Oh Womanizer Oh Ur a Womanizer Babeh"
In Kill The Lights:
If ur feeling froggy leap.......
Funny cause the worst bit is also in Kill the Lights... I KEEEEL
In If You Seek Amy:
La La La LaLaLaLa La La La La La LaLaLaLa LaLa
So whats ur fav bit?